Take a lineage of microscopic marine animals known as bdelloid rotifers.Most rotifers reproduce sexually, but bdelloid rotifers abandoned sex about 100 million years ago. 就拿海洋中的微小動(dòng)物蛭形輪蟲(chóng)來(lái)說(shuō)，大部份輪蟲(chóng)行有性生殖，但是蛭形輪蟲(chóng)已經(jīng)把性丟開(kāi)約一億年了。
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